Improvement in rotary engines



G. w.-CUMM|NGS.

Rotary Engines'.

NG ULi-25] Patentedjuly29,183.

AM, PflooimfosmFH/o co. Anwesen/MEI; mams) UNITED STATES PATENT OFFICE.

GEORGE W. OUMMINGS, OF GONNEAUT, OHIO, ASSIGNOR OF ONE-HALF HIS RIGHT TO DANIEL W. HAZELTINE, OF SAME PLAGE.

IMPROVEMENT lN ROTARY ENGINES.

Specification forming part of Letters Patent No. 141,261, dated July 29, 1873 application filed February 8, 1873.

To all whom it may concern:

Be it known that I, GEORGE W. GUMMiNes, of Gonneaut, in the county of Ashtabula and State of Ohio, have invent-ed a new and Improved Rotary' Steam-Engine, of which the following is a specification:

Figure 1 is a plan view of my invention with parts open to show interior connection, and Fig. 2 is a vertical section of the same on the line c c, Fig. 1, also partly opened.

Similar letters of reference indicate corresponding parts.

The object of my invention is improvement in the class of rotary engines and pumps having a piston-box placed eceentrically within the steam cylinder and controlling the pistonarms. I n my invention the piston-arms are arranged concentrically with the steam-cylinder and tightly fitted to it by means of springs and packing.

In the drawing, Arepresents the outer steamcylinder with steam-ports a and a2 and exhausts b and b2. The ports a a2 are close to each other, a pivoted packing, d, between them establishing the contact with the piston-box B. The exhaust-ports b b2 lead out through the sides of the cylinder A, and will be, in practice, provided with valves, so arranged that when steam is admitted through port a the exhaust b2 will be closed and b opened, and vice versa. When steam enters at a2 the exhaust b will be closed and b2 opened. Thus the pistons may be caused to move in either direction around their axis. A grooved recess, c, of cylinder A, connects the ports and exhausts, and is gradually diminishingfrom the former to the latter. A suitable lever and valve arrangement opens and closes the corresponding ports and exhausts. The pistonbox B is placed at j', eceentrically to the inclosing steam cylinder, and of somewhat smaller diameter. It is of drum-like shape,

and fits to the bottom and top of the steamcylinder A. Dovetail-shaped apertures g, of the top ofthe piston-box, connect with vertical extensions at the side thereof to allow the free play of the projecting piston-arms C. These are closely fitted to the piston-box B by packings h. The piston-arms O are secured diametrically to the cylindrical center-piece I) of the steam-cylinder by ringshaped bands t', fitting one above the other, and furthermore supplied with segmental supports K, into which are let by proper means strong springs Z, which serve to press the pistou-arms C closely to the periphery of the steam-cylinder A. The upper segmental support lc, and spring l of one arm, press toward the upper ring of the other arm, and similarly the lower supports and ways. The ends of the piston-arms extend vertically into the apertures g, and are projecting more or less outside of the eccentric piston-box B, the nearer or further they are from the steam-ports a and a2.

As soon as the steam enters for forward inotion through steam-port c, it moves both pistons-one directly, the other lby means of the recess e-till the piston-arm C has passed the closed exhaust b2, when the full power of the steam acts on the same, the exhaust steam on the other arm escaping at the exhaust b. One arm, C, being, at full stroke, the other passes port a, and is acted upon by the steam, recess c admitting sufficient steam to the forward arm to finish its vstroke by expansion, till exhaust b2 is passed and a full head of steam carries the former forward, the exhaust steam escaping at b again, and so on. To reverse the engine, steam is allowed to enter at port a2 and to escape at b2 with precisely the same effect on the piston-arms.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent- The piston-arms C, with rings z', segmental supports 7c, and springs l, in connection with the ports a a2, exhausts b b2, and grooved recesses E of cylinder A, as set forth.

GEORGE WV. OUMMINGS. Witnesses:

JAMES H. JUDsoN, PAYNE BAILEY. 

